Fear of amoebas?

I think that's just a rational fear. XD Keep in mind, they only inhabit fresh water bodies. Especially ponds or lakes. And as long as you keep your head above the water and don't dunk, you're totally fine to swim in a lake. They don't survive in the salinity of the ocean or the chlorination of pools.

As someone who both has OCD and works in infectious disease ironically, I definitely have a mild, but (usually) healthy non-ocd fear of it. As for giving information that you may not know, the amoeba can only grow in sediment conditions in warm, stagnant, freshwater/untreated water. Thus because of this, I only tend to avoid swimming in ponds (oceans don’t have it, the lakes where I’m at are too cool and too deep for it, plus movement from the river and boats keeps the water moving). As such, it’s practically impossible to get it from a pool if its properly chlorinated, and even than, the VAST majority of the few cases that occur in the US (usually only 1-3 cases reported per year) are from natural reservoirs like ponds and lakes. Even with this, the amoeba has to be aggressively shot up your nose/snorted to be infected— I’m fairly certain there’s been no cases by any casual contact. BUT, here’s the second part. That’s atleast my scientific takeaway of naegleria fowleri, but we’re also talking about OCD here. If you read that information and are content with it, great! But if this is an obsession, there’s a good chance that this explanation won’t be good enough at some point and you’ll keep experiencing anxiety around it (what if this pool isn’t good enough? What if this temperature isn’t right? The last pool was on but what about THIS pool? What about THIS lake?! Etc.) and so on. My advice is to stick with what the experts say (not necessarily me, but ONLY check out the cdc’s advice for example), and go based off of that. Any other anxiety that comes up about it that’s not cited as a cdc concern? Try not to compulsively reassure, google, or other compulsions, and if you can’t do that, try to delay compulsions. If you have an OCD therapist, this could be a great conversation with them to ensure you have helpful information BUT aren’t using it compulsively or continually forever getting reassurance for it. OCD’s an ass, especially when it latches onto spooky pathogens, but you’ve got this!